72688723 has 4 divisors (see below), whose sum is σ = 72716560. Its totient is φ = 72660888.

The previous prime is 72688691. The next prime is 72688739. The reversal of 72688723 is 32788627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32788627 = 397 ⋅82591.

It is a cyclic number.

It is not a de Polignac number, because 72688723 - 2⁵ = 72688691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72688723.

It is not an unprimeable number, because it can be changed into a prime (72688783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9543 + ... + 15376.

It is an arithmetic number, because the mean of its divisors is an integer number (18179140).

Almost surely, 2^72688723 is an apocalyptic number.

72688723 is a deficient number, since it is larger than the sum of its proper divisors (27837).

72688723 is a wasteful number, since it uses less digits than its factorization.

72688723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27836.

The product of its digits is 225792, while the sum is 43.

The square root of 72688723 is about 8525.7681765340. The cubic root of 72688723 is about 417.3390403469.

The spelling of 72688723 in words is "seventy-two million, six hundred eighty-eight thousand, seven hundred twenty-three".